So I'll absolutely give Scrivener's Hall the award for better dungeon mechanically and aesthetically. However I was blown away by Bal Sunnar's time travel quest!
The small bits like Saresea acknowledging you being a Psijic member, all the way to her far-out dialogue at the end. She talks about how her body and mind are in multiple places and times at once; being able to see her own birth (and ours), being locked away in Artaeum, seeing her own death, and standing in the present. She even gives you a prophetic description reminiscent to the Grand Prognosticator stuff in Clockwork City DLC.
Just another knockout for the wacky/dank lore of ESO. Just wanted to share my praises!